Horsepower: John Deere 4450 is about 140 PTO. The 150HP MX150 is probably rated about 130 PTO HP. The MX has more electronics; therefore if something goes wrong!!! You will more likely have to call a dealer. If you have the tools You can work on the 4450 for the most part. Also if the 2 tractors are the same price. You "should" be able to get a 4450 for a whole lot cheaper $. A 4450 top price should about where the MX;'s low price begins. & I mean a really good 4450 compared to a less than well cared for MX!

A 50-series JD is a 1980s tractor, a MX is a 2000s tractor. You get all kinds of bells and whistles with a tractor that's a generation newer. I believe they were both good models though. If all things are equal (price and hours), I would go with the MX.

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